Year	Percent Change
1971-01-01	12.57457304352870
1972-01-01	8.20438440190241
1973-01-01	21.63007873949190
1974-01-01	16.53372747876030
1975-01-01	18.25311201534140
1976-01-01	18.42242115567870
1977-01-01	27.85808787919950
1978-01-01	11.33678532141510
1979-01-01	14.04686803209720
1980-01-01	20.19353791619580
1981-01-01	22.94012228696120
1982-01-01	13.15064659944960
1983-01-01	11.69601294270900
1984-01-01	7.67420048688926
1985-01-01	11.79329572503570
1986-01-01	11.45710956110750
1987-01-01	6.03413698546933
1988-01-01	6.78968372756755
1989-01-01	6.77678934776262
1990-01-01	10.98464399632520
1991-01-01	10.94730899955170
1992-01-01	8.96263213951331
1993-01-01	5.62789710624230
1994-01-01	3.16588863561301
1995-01-01	1.58128795575364
1996-01-01	2.61637808851159
1997-01-01	6.49257700182351
1998-01-01	-1.24530845766883
1999-01-01	4.20731839022801
2000-01-01	1.13858788967847
2001-01-01	1.44200169500449
2002-01-01	3.39950364762344
2003-01-01	4.61310215529613
2004-01-01	4.46272891932590
2005-01-01	3.59158651412710
2006-01-01	1.58333019782565
2007-01-01	5.53506542132378
2008-01-01	7.56188501727620
2009-01-01	7.90910582231934
2010-01-01	4.35058719317486